package com.hmdp.utils;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    /**
     * 开始时间戳
     */
    private static final Long BEGIN_TIMESTAMP=1762128000L;
    private static final int COUNT_BITS=32;

    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    public long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowEpochSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowEpochSecond - BEGIN_TIMESTAMP;

        //2.生成序列号
        //2.1.获取当前日期，精确到天
        String data = now.format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + data);
        //3.拼接并返回
        return timestamp<<COUNT_BITS | count;

    }


}
